Section-5 Maintenance

October 17, 2013

5‐6

WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004

SeeSection2.13onpage2‐21andfollowingsectionsforLPUandTCUwebbrowserconnectionandlogin

information.Harrisr

ecommendsuseoftheChromeorFirefoxwebbrowser.

Calibrateusi

ngthelocalTCUGUIorwebbrowserbynavigatingtotheLPUUAXHome>Config>System

Configuration>Cal’SystemCalibration’screenandpressthepulldownmenuarrowtoshowthecalibrationoptions

(seeFigure5‐3onle

ftbelow).

Forwardc

alibrationmustbeperformedfirstandisfollowedbyreflectedcalibration.Afterselectingthecalibration

type,presstheStartCalsoftkeytobeginthecalibrationprocess(seeFigure5‐3onrigh

tbelow).

Figure 5-3 on

left - System Calibration options on right - System Calibration started

Powerc

alibrationsinclude:

• Forward‐Powerattheoutputofthetransmitteramplifyingstages,beforethebandpassfilter(BPF).

• Reflected‐Poweratthe outputofthetransmitteramplifyingstagesandbeforethebandpassfilter(BPF).

• UDCOut‐PoweratoutputofLPUmodulatorstage(SMAconnectoronupperrearofLPU)

• LPUForward‐Powerattheoutput(typeN)oftheLPUamplifiersection

• PAB#Forward‐Powerattheoutputofindividualpoweramplifierblocks

• PAB#Reflected‐Powerattheoutputofindividualpoweramplifierblocks

Note

Re-calibration is not typically required in the field once the transmitter is in service. Re-calibration would

be indicated only for verification, frequency change, or after major service work involving replacement of

one or more power metering components has been performed.

EquipmentUsed:

• AnHPEPM‐seriesPowerMeterand8482HPowerSensor,orAgilentE4418BandType“N”toSMAadapter(or

equivalent).MetershouldbecapableofdisplayingmeasuredvaluesinWattsorindBm.

• Precisiondi rectional couplers(precisioninthesensethatthecouplingratioshavebeenmeasuredforthe

operatingfrequenciestoahighdegreeofprecision).

Caution

THE REFLECTED POWER FAULTS ARE DISABLED DURING THE POWER

CALIBRATION PROCEDURE. EXIT FROM THE CALIBRATION PROCEDURE

WHEN CALIBRATION IS COMPLETE TO AUTOMATICALLY REACTIVATE

REFLECTED POWER PROTECTIONS.

Note

Read and understand the applicable power calibration procedure before beginning. The procedures below

assume use of the LCD display and the buttons on the front of the LPU. The procedure can also be per

formed using the web browser screens. Screen captures, such as seen in Figure 5-3 on page 5-6, should be

assumed to be via web browser.

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